LeetCode 344. Reverse String

Problem:

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh". 

此题一般思路为：在原数组上直接对s[i]以及s[len-i-1]进行调换即可。

 char* reverseString(char* s) {
     int i = , len = ;
     len = strlen(s);
      for (i = ; i < len / ; i++) {
             int tmp = s[i];
             s[i] = s[len - i - ];
             s[len - i - ] = tmp;
         }
     return s;
 }